1 /* 2 * linux/fs/lockd/svc4proc.c 3 * 4 * Lockd server procedures. We don't implement the NLM_*_RES 5 * procedures because we don't use the async procedures. 6 * 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #include <linux/types.h> 11 #include <linux/time.h> 12 #include <linux/slab.h> 13 #include <linux/smp_lock.h> 14 #include <linux/in.h> 15 #include <linux/sunrpc/svc.h> 16 #include <linux/sunrpc/clnt.h> 17 #include <linux/nfsd/nfsd.h> 18 #include <linux/lockd/lockd.h> 19 #include <linux/lockd/share.h> 20 21 #define NLMDBG_FACILITY NLMDBG_CLIENT 22 23 /* 24 * Obtain client and file from arguments 25 */ 26 static __be32 27 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 28 struct nlm_host **hostp, struct nlm_file **filp) 29 { 30 struct nlm_host *host = NULL; 31 struct nlm_file *file = NULL; 32 struct nlm_lock *lock = &argp->lock; 33 __be32 error = 0; 34 35 /* nfsd callbacks must have been installed for this procedure */ 36 if (!nlmsvc_ops) 37 return nlm_lck_denied_nolocks; 38 39 /* Obtain host handle */ 40 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 41 || (argp->monitor && nsm_monitor(host) < 0)) 42 goto no_locks; 43 *hostp = host; 44 45 /* Obtain file pointer. Not used by FREE_ALL call. */ 46 if (filp != NULL) { 47 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 48 goto no_locks; 49 *filp = file; 50 51 /* Set up the missing parts of the file_lock structure */ 52 lock->fl.fl_file = file->f_file; 53 lock->fl.fl_owner = (fl_owner_t) host; 54 lock->fl.fl_lmops = &nlmsvc_lock_operations; 55 } 56 57 return 0; 58 59 no_locks: 60 nlm_release_host(host); 61 if (error) 62 return error; 63 return nlm_lck_denied_nolocks; 64 } 65 66 /* 67 * NULL: Test for presence of service 68 */ 69 static __be32 70 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 71 { 72 dprintk("lockd: NULL called\n"); 73 return rpc_success; 74 } 75 76 /* 77 * TEST: Check for conflicting lock 78 */ 79 static __be32 80 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 81 struct nlm_res *resp) 82 { 83 struct nlm_host *host; 84 struct nlm_file *file; 85 __be32 rc = rpc_success; 86 87 dprintk("lockd: TEST4 called\n"); 88 resp->cookie = argp->cookie; 89 90 /* Obtain client and file */ 91 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 92 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 93 94 /* Now check for conflicting locks */ 95 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 96 if (resp->status == nlm_drop_reply) 97 rc = rpc_drop_reply; 98 else 99 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 100 101 nlm_release_host(host); 102 nlm_release_file(file); 103 return rc; 104 } 105 106 static __be32 107 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 108 struct nlm_res *resp) 109 { 110 struct nlm_host *host; 111 struct nlm_file *file; 112 __be32 rc = rpc_success; 113 114 dprintk("lockd: LOCK called\n"); 115 116 resp->cookie = argp->cookie; 117 118 /* Obtain client and file */ 119 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 120 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 121 122 #if 0 123 /* If supplied state doesn't match current state, we assume it's 124 * an old request that time-warped somehow. Any error return would 125 * do in this case because it's irrelevant anyway. 126 * 127 * NB: We don't retrieve the remote host's state yet. 128 */ 129 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 130 resp->status = nlm_lck_denied_nolocks; 131 } else 132 #endif 133 134 /* Now try to lock the file */ 135 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock, 136 argp->block, &argp->cookie, 137 argp->reclaim); 138 if (resp->status == nlm_drop_reply) 139 rc = rpc_drop_reply; 140 else 141 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 142 143 nlm_release_host(host); 144 nlm_release_file(file); 145 return rc; 146 } 147 148 static __be32 149 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 150 struct nlm_res *resp) 151 { 152 struct nlm_host *host; 153 struct nlm_file *file; 154 155 dprintk("lockd: CANCEL called\n"); 156 157 resp->cookie = argp->cookie; 158 159 /* Don't accept requests during grace period */ 160 if (locks_in_grace()) { 161 resp->status = nlm_lck_denied_grace_period; 162 return rpc_success; 163 } 164 165 /* Obtain client and file */ 166 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 167 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 168 169 /* Try to cancel request. */ 170 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 171 172 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 173 nlm_release_host(host); 174 nlm_release_file(file); 175 return rpc_success; 176 } 177 178 /* 179 * UNLOCK: release a lock 180 */ 181 static __be32 182 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 183 struct nlm_res *resp) 184 { 185 struct nlm_host *host; 186 struct nlm_file *file; 187 188 dprintk("lockd: UNLOCK called\n"); 189 190 resp->cookie = argp->cookie; 191 192 /* Don't accept new lock requests during grace period */ 193 if (locks_in_grace()) { 194 resp->status = nlm_lck_denied_grace_period; 195 return rpc_success; 196 } 197 198 /* Obtain client and file */ 199 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 200 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 201 202 /* Now try to remove the lock */ 203 resp->status = nlmsvc_unlock(file, &argp->lock); 204 205 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 206 nlm_release_host(host); 207 nlm_release_file(file); 208 return rpc_success; 209 } 210 211 /* 212 * GRANTED: A server calls us to tell that a process' lock request 213 * was granted 214 */ 215 static __be32 216 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 217 struct nlm_res *resp) 218 { 219 resp->cookie = argp->cookie; 220 221 dprintk("lockd: GRANTED called\n"); 222 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 223 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 224 return rpc_success; 225 } 226 227 /* 228 * This is the generic lockd callback for async RPC calls 229 */ 230 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 231 { 232 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 233 -task->tk_status); 234 } 235 236 static void nlm4svc_callback_release(void *data) 237 { 238 lock_kernel(); 239 nlm_release_call(data); 240 unlock_kernel(); 241 } 242 243 static const struct rpc_call_ops nlm4svc_callback_ops = { 244 .rpc_call_done = nlm4svc_callback_exit, 245 .rpc_release = nlm4svc_callback_release, 246 }; 247 248 /* 249 * `Async' versions of the above service routines. They aren't really, 250 * because we send the callback before the reply proper. I hope this 251 * doesn't break any clients. 252 */ 253 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 254 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 255 { 256 struct nlm_host *host; 257 struct nlm_rqst *call; 258 __be32 stat; 259 260 host = nlmsvc_lookup_host(rqstp, 261 argp->lock.caller, 262 argp->lock.len); 263 if (host == NULL) 264 return rpc_system_err; 265 266 call = nlm_alloc_call(host); 267 if (call == NULL) 268 return rpc_system_err; 269 270 stat = func(rqstp, argp, &call->a_res); 271 if (stat != 0) { 272 nlm_release_call(call); 273 return stat; 274 } 275 276 call->a_flags = RPC_TASK_ASYNC; 277 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 278 return rpc_system_err; 279 return rpc_success; 280 } 281 282 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 283 void *resp) 284 { 285 dprintk("lockd: TEST_MSG called\n"); 286 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 287 } 288 289 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 290 void *resp) 291 { 292 dprintk("lockd: LOCK_MSG called\n"); 293 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 294 } 295 296 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 297 void *resp) 298 { 299 dprintk("lockd: CANCEL_MSG called\n"); 300 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 301 } 302 303 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 304 void *resp) 305 { 306 dprintk("lockd: UNLOCK_MSG called\n"); 307 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 308 } 309 310 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 311 void *resp) 312 { 313 dprintk("lockd: GRANTED_MSG called\n"); 314 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 315 } 316 317 /* 318 * SHARE: create a DOS share or alter existing share. 319 */ 320 static __be32 321 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 322 struct nlm_res *resp) 323 { 324 struct nlm_host *host; 325 struct nlm_file *file; 326 327 dprintk("lockd: SHARE called\n"); 328 329 resp->cookie = argp->cookie; 330 331 /* Don't accept new lock requests during grace period */ 332 if (locks_in_grace() && !argp->reclaim) { 333 resp->status = nlm_lck_denied_grace_period; 334 return rpc_success; 335 } 336 337 /* Obtain client and file */ 338 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 339 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 340 341 /* Now try to create the share */ 342 resp->status = nlmsvc_share_file(host, file, argp); 343 344 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 345 nlm_release_host(host); 346 nlm_release_file(file); 347 return rpc_success; 348 } 349 350 /* 351 * UNSHARE: Release a DOS share. 352 */ 353 static __be32 354 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 355 struct nlm_res *resp) 356 { 357 struct nlm_host *host; 358 struct nlm_file *file; 359 360 dprintk("lockd: UNSHARE called\n"); 361 362 resp->cookie = argp->cookie; 363 364 /* Don't accept requests during grace period */ 365 if (locks_in_grace()) { 366 resp->status = nlm_lck_denied_grace_period; 367 return rpc_success; 368 } 369 370 /* Obtain client and file */ 371 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 372 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 373 374 /* Now try to lock the file */ 375 resp->status = nlmsvc_unshare_file(host, file, argp); 376 377 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 378 nlm_release_host(host); 379 nlm_release_file(file); 380 return rpc_success; 381 } 382 383 /* 384 * NM_LOCK: Create an unmonitored lock 385 */ 386 static __be32 387 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 388 struct nlm_res *resp) 389 { 390 dprintk("lockd: NM_LOCK called\n"); 391 392 argp->monitor = 0; /* just clean the monitor flag */ 393 return nlm4svc_proc_lock(rqstp, argp, resp); 394 } 395 396 /* 397 * FREE_ALL: Release all locks and shares held by client 398 */ 399 static __be32 400 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 401 void *resp) 402 { 403 struct nlm_host *host; 404 405 /* Obtain client */ 406 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 407 return rpc_success; 408 409 nlmsvc_free_host_resources(host); 410 nlm_release_host(host); 411 return rpc_success; 412 } 413 414 /* 415 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 416 */ 417 static __be32 418 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 419 void *resp) 420 { 421 dprintk("lockd: SM_NOTIFY called\n"); 422 423 if (!nlm_privileged_requester(rqstp)) { 424 char buf[RPC_MAX_ADDRBUFLEN]; 425 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 426 svc_print_addr(rqstp, buf, sizeof(buf))); 427 return rpc_system_err; 428 } 429 430 nlm_host_rebooted(argp); 431 return rpc_success; 432 } 433 434 /* 435 * client sent a GRANTED_RES, let's remove the associated block 436 */ 437 static __be32 438 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 439 void *resp) 440 { 441 if (!nlmsvc_ops) 442 return rpc_success; 443 444 dprintk("lockd: GRANTED_RES called\n"); 445 446 nlmsvc_grant_reply(&argp->cookie, argp->status); 447 return rpc_success; 448 } 449 450 451 /* 452 * NLM Server procedures. 453 */ 454 455 #define nlm4svc_encode_norep nlm4svc_encode_void 456 #define nlm4svc_decode_norep nlm4svc_decode_void 457 #define nlm4svc_decode_testres nlm4svc_decode_void 458 #define nlm4svc_decode_lockres nlm4svc_decode_void 459 #define nlm4svc_decode_unlockres nlm4svc_decode_void 460 #define nlm4svc_decode_cancelres nlm4svc_decode_void 461 #define nlm4svc_decode_grantedres nlm4svc_decode_void 462 463 #define nlm4svc_proc_none nlm4svc_proc_null 464 #define nlm4svc_proc_test_res nlm4svc_proc_null 465 #define nlm4svc_proc_lock_res nlm4svc_proc_null 466 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 467 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 468 469 struct nlm_void { int dummy; }; 470 471 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 472 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 473 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 474 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 475 .pc_release = NULL, \ 476 .pc_argsize = sizeof(struct nlm_##argt), \ 477 .pc_ressize = sizeof(struct nlm_##rest), \ 478 .pc_xdrressize = respsize, \ 479 } 480 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 481 #define No (1+1024/4) /* netobj */ 482 #define St 1 /* status */ 483 #define Rg 4 /* range (offset + length) */ 484 struct svc_procedure nlmsvc_procedures4[] = { 485 PROC(null, void, void, void, void, 1), 486 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 487 PROC(lock, lockargs, res, args, res, Ck+St), 488 PROC(cancel, cancargs, res, args, res, Ck+St), 489 PROC(unlock, unlockargs, res, args, res, Ck+St), 490 PROC(granted, testargs, res, args, res, Ck+St), 491 PROC(test_msg, testargs, norep, args, void, 1), 492 PROC(lock_msg, lockargs, norep, args, void, 1), 493 PROC(cancel_msg, cancargs, norep, args, void, 1), 494 PROC(unlock_msg, unlockargs, norep, args, void, 1), 495 PROC(granted_msg, testargs, norep, args, void, 1), 496 PROC(test_res, testres, norep, res, void, 1), 497 PROC(lock_res, lockres, norep, res, void, 1), 498 PROC(cancel_res, cancelres, norep, res, void, 1), 499 PROC(unlock_res, unlockres, norep, res, void, 1), 500 PROC(granted_res, res, norep, res, void, 1), 501 /* statd callback */ 502 PROC(sm_notify, reboot, void, reboot, void, 1), 503 PROC(none, void, void, void, void, 0), 504 PROC(none, void, void, void, void, 0), 505 PROC(none, void, void, void, void, 0), 506 PROC(share, shareargs, shareres, args, res, Ck+St+1), 507 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 508 PROC(nm_lock, lockargs, res, args, res, Ck+St), 509 PROC(free_all, notify, void, args, void, 1), 510 511 }; 512